ref: 064740662b4b78775c62f610a84dc17969a1aabf
dir: /libfaad/sbr_dec.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through [email protected].
**
** $Id: sbr_dec.c,v 1.16 2003/11/02 20:24:05 menno Exp $
**/
#include "common.h"
#include "structs.h"
#ifdef SBR_DEC
#include <stdlib.h>
#include "syntax.h"
#include "bits.h"
#include "sbr_syntax.h"
#include "sbr_qmf.h"
#include "sbr_hfgen.h"
#include "sbr_hfadj.h"
sbr_info *sbrDecodeInit(uint16_t framelength
#ifdef DRM
, uint8_t IsDRM
#endif
)
{
sbr_info *sbr = malloc(sizeof(sbr_info));
memset(sbr, 0, sizeof(sbr_info));
sbr->bs_freq_scale = 2;
sbr->bs_alter_scale = 1;
sbr->bs_noise_bands = 2;
sbr->bs_limiter_bands = 2;
sbr->bs_limiter_gains = 2;
sbr->bs_interpol_freq = 1;
sbr->bs_smoothing_mode = 1;
sbr->bs_start_freq = 5;
sbr->bs_amp_res = 1;
sbr->bs_samplerate_mode = 1;
sbr->prevEnvIsShort[0] = -1;
sbr->prevEnvIsShort[1] = -1;
sbr->header_count = 0;
#ifdef DRM
sbr->Is_DRM_SBR = 0;
if (IsDRM)
{
sbr->Is_DRM_SBR = 1;
sbr->tHFGen = T_HFGEN_DRM;
sbr->tHFAdj = T_HFADJ_DRM;
/* "offset" is different in DRM */
sbr->bs_samplerate_mode = 0;
} else
#endif
{
sbr->bs_samplerate_mode = 1;
sbr->tHFGen = T_HFGEN;
sbr->tHFAdj = T_HFADJ;
}
/* force sbr reset */
sbr->bs_start_freq_prev = -1;
if (framelength == 960)
{
sbr->numTimeSlotsRate = RATE * NO_TIME_SLOTS_960;
sbr->numTimeSlots = NO_TIME_SLOTS_960;
} else {
sbr->numTimeSlotsRate = RATE * NO_TIME_SLOTS;
sbr->numTimeSlots = NO_TIME_SLOTS;
}
return sbr;
}
void sbrDecodeEnd(sbr_info *sbr)
{
uint8_t j;
if (sbr)
{
qmfa_end(sbr->qmfa[0]);
qmfs_end(sbr->qmfs[0]);
if (sbr->id_aac == ID_CPE)
{
qmfa_end(sbr->qmfa[1]);
qmfs_end(sbr->qmfs[1]);
}
//if (sbr->Xcodec[0]) free(sbr->Xcodec[0]);
//if (sbr->Xsbr[0]) free(sbr->Xsbr[0]);
//if (sbr->Xcodec[1]) free(sbr->Xcodec[1]);
//if (sbr->Xsbr[1]) free(sbr->Xsbr[1]);
for (j = 0; j < 5; j++)
{
if (sbr->G_temp_prev[0][j]) free(sbr->G_temp_prev[0][j]);
if (sbr->Q_temp_prev[0][j]) free(sbr->Q_temp_prev[0][j]);
if (sbr->G_temp_prev[1][j]) free(sbr->G_temp_prev[1][j]);
if (sbr->Q_temp_prev[1][j]) free(sbr->Q_temp_prev[1][j]);
}
free(sbr);
}
}
void sbr_save_prev_data(sbr_info *sbr, uint8_t ch)
{
uint8_t i;
/* save data for next frame */
sbr->kx_prev = sbr->kx;
sbr->L_E_prev[ch] = sbr->L_E[ch];
sbr->f_prev[ch] = sbr->f[ch][sbr->L_E[ch] - 1];
for (i = 0; i < 64; i++)
{
sbr->E_prev[ch][i] = sbr->E[ch][i][sbr->L_E[ch] - 1];
sbr->Q_prev[ch][i] = sbr->Q[ch][i][sbr->L_Q[ch] - 1];
}
for (i = 0; i < 64; i++)
{
sbr->bs_add_harmonic_prev[ch][i] = sbr->bs_add_harmonic[ch][i];
}
sbr->bs_add_harmonic_flag_prev[ch] = sbr->bs_add_harmonic_flag[ch];
if (sbr->l_A[ch] == sbr->L_E[ch])
sbr->prevEnvIsShort[ch] = 0;
else
sbr->prevEnvIsShort[ch] = -1;
}
void sbrDecodeFrame(sbr_info *sbr, real_t *left_channel,
real_t *right_channel,
const uint8_t just_seeked, const uint8_t upsample_only)
{
int16_t i, k, l;
uint8_t dont_process = 0;
uint8_t ch, channels, ret;
real_t *ch_buf;
qmf_t X[MAX_NTSR][64];
#ifdef SBR_LOW_POWER
real_t deg[64];
#endif
bitfile *ld = NULL;
channels = (sbr->id_aac == ID_SCE) ? 1 : 2;
if (sbr->data == NULL || sbr->data_size == 0)
{
ret = 1;
} else {
ld = (bitfile*)malloc(sizeof(bitfile));
/* initialise and read the bitstream */
faad_initbits(ld, sbr->data, sbr->data_size);
ret = sbr_extension_data(ld, sbr);
ret = ld->error ? ld->error : ret;
faad_endbits(ld);
if (ld) free(ld);
ld = NULL;
}
if (sbr->data) free(sbr->data);
sbr->data = NULL;
if (ret || (sbr->header_count == 0))
{
/* don't process just upsample */
dont_process = 1;
/* Re-activate reset for next frame */
if (ret && sbr->Reset)
sbr->bs_start_freq_prev = -1;
}
if (just_seeked)
{
sbr->just_seeked = 1;
} else {
sbr->just_seeked = 0;
}
for (ch = 0; ch < channels; ch++)
{
if (sbr->frame == 0)
{
uint8_t j;
sbr->qmfa[ch] = qmfa_init(32);
sbr->qmfs[ch] = qmfs_init(64);
for (j = 0; j < 5; j++)
{
sbr->G_temp_prev[ch][j] = malloc(64*sizeof(real_t));
sbr->Q_temp_prev[ch][j] = malloc(64*sizeof(real_t));
}
memset(sbr->Xsbr[ch], 0, (sbr->numTimeSlotsRate+sbr->tHFGen)*64 * sizeof(qmf_t));
memset(sbr->Xcodec[ch], 0, (sbr->numTimeSlotsRate+sbr->tHFGen)*32 * sizeof(qmf_t));
}
if (ch == 0)
ch_buf = left_channel;
else
ch_buf = right_channel;
/* subband analysis */
if (dont_process)
sbr_qmf_analysis_32(sbr, sbr->qmfa[ch], ch_buf, sbr->Xcodec[ch], sbr->tHFGen, 32);
else
sbr_qmf_analysis_32(sbr, sbr->qmfa[ch], ch_buf, sbr->Xcodec[ch], sbr->tHFGen, sbr->kx);
if (!dont_process)
{
/* insert high frequencies here */
/* hf generation using patching */
hf_generation(sbr, sbr->Xcodec[ch], sbr->Xsbr[ch]
#ifdef SBR_LOW_POWER
,deg
#endif
,ch);
#ifdef SBR_LOW_POWER
for (l = sbr->t_E[ch][0]; l < sbr->t_E[ch][sbr->L_E[ch]]; l++)
{
for (k = 0; k < sbr->kx; k++)
{
QMF_RE(sbr->Xsbr[ch][sbr->tHFAdj + l][k]) = 0;
}
}
#endif
#if 1
/* hf adjustment */
hf_adjustment(sbr, sbr->Xsbr[ch]
#ifdef SBR_LOW_POWER
,deg
#endif
,ch);
#endif
}
if ((sbr->just_seeked != 0) || dont_process)
{
for (l = 0; l < sbr->numTimeSlotsRate; l++)
{
for (k = 0; k < 32; k++)
{
QMF_RE(X[l][k]) = QMF_RE(sbr->Xcodec[ch][l + sbr->tHFAdj][k]);
#ifndef SBR_LOW_POWER
QMF_IM(X[l][k]) = QMF_IM(sbr->Xcodec[ch][l + sbr->tHFAdj][k]);
#endif
}
for (k = 32; k < 64; k++)
{
QMF_RE(X[l][k]) = 0;
#ifndef SBR_LOW_POWER
QMF_IM(X[l][k]) = 0;
#endif
}
}
} else {
for (l = 0; l < sbr->numTimeSlotsRate; l++)
{
uint8_t xover_band;
if (l < sbr->t_E[ch][0])
xover_band = sbr->kx_prev;
else
xover_band = sbr->kx;
#ifdef DRM
if (sbr->Is_DRM_SBR)
xover_band = sbr->kx;
#endif
for (k = 0; k < xover_band; k++)
{
QMF_RE(X[l][k]) = QMF_RE(sbr->Xcodec[ch][l + sbr->tHFAdj][k]);
#ifndef SBR_LOW_POWER
QMF_IM(X[l][k]) = QMF_IM(sbr->Xcodec[ch][l + sbr->tHFAdj][k]);
#endif
}
for (k = xover_band; k < 64; k++)
{
QMF_RE(X[l][k]) = QMF_RE(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
#ifndef SBR_LOW_POWER
QMF_IM(X[l][k]) = QMF_IM(sbr->Xsbr[ch][l + sbr->tHFAdj][k]);
#endif
}
#ifdef SBR_LOW_POWER
QMF_RE(X[l][xover_band - 1]) += QMF_RE(sbr->Xsbr[ch][l + sbr->tHFAdj][xover_band - 1]);
#endif
#ifdef DRM
if (sbr->Is_DRM_SBR)
{
for (k = xover_band; k < xover_band + 4; k++)
{
QMF_RE(X[l][k]) += QMF_RE(sbr->Xcodec[ch][l + sbr->tHFAdj][k]);
QMF_IM(X[l][k]) += QMF_IM(sbr->Xcodec[ch][l + sbr->tHFAdj][k]);
}
}
#endif
}
}
/* subband synthesis */
sbr_qmf_synthesis_64(sbr, sbr->qmfs[ch], X, ch_buf);
for (i = 0; i < sbr->tHFGen; i++)
{
memmove(sbr->Xcodec[ch][i], sbr->Xcodec[ch][i+sbr->numTimeSlotsRate], 32 * sizeof(qmf_t));
memmove(sbr->Xsbr[ch][i], sbr->Xsbr[ch][i+sbr->numTimeSlotsRate], 64 * sizeof(qmf_t));
}
}
if (sbr->bs_header_flag)
sbr->just_seeked = 0;
if (sbr->header_count != 0)
{
for (ch = 0; ch < channels; ch++)
sbr_save_prev_data(sbr, ch);
}
sbr->frame++;
}
#endif